Phonograph drive mechanism



H. K SANDEU.. PHoNpGRAPH nmvE MEcHAmsM. .A APPLICATION FILED APR-11.1921. 1,417,109, Patented May 23, 1922.

HIHIIIIIHII llilllllllllh H. K.' SANDELL. PHONOGAPH DRIVE MECHANISM.

APPLlcATmN man mm1, 1921.

YPatented May 23,1922u 4 sHEETs- MEET 2 n Mm H K SANDELL PHONOGRAPH DRIVE MECHANISM. APPLICATIGN FILED APR. Hf 192i! x 1,417,109, Patented May 23, 1922.

UNITED srarsseA PATENT orties.

HENRY x. sANnnLnOr CHICAGO, ILLINOIS, AssIGNOa To H. s. ivIILLs, or OHIO-AGO..

f. ILLINOIS.

PHONOGRAPH DRIVE MCHANISM.

To all whom t may `concern y Be it known that I, Hic-NRI K. SANDELL, a citizen of the United States, residing at 221 South Green Street, Chicago, in lthe county of. Cook and State of illinois, have invented a newy and useful Improvement in Plionograph Drive Mechanism, of which the following is a specification.

The present invention relates to phonographs, particularly of theI disc type and to dynamo electric drive mechanism ysuitable toreusevin connection therewith.' It will be :hilly understood from the following description thereof, illustrated by the accom panying drawings, in which:

Fig. 1 is a vertical sectional view through the disc supporting table and the drive mo-l tor thereof, takenion the broken line 1-1 of Fig; 6; l

Fig. 2 .is a `horizontal sectional view on the broken line 2 2 ot' Fig. 1;

Fig. 8 `is a detail sectional view oiE the governor balance wheel and the associated devices; f

Fig.' .4t is a. vertical sectional detail view on the line 41 of Fig. 2; e

n 5 is a broken sectional detail view on the line 5 of Fig. 2;'

Fig. 6 `is a plan view of the device with the disc supportingtable and the cabinet top removed; l I

Fin'. 7 is a detailfl'iroken elevation ot the laminated armature secured to the .disc-` supporting table, and

Fig. 8 is a detail plan view of a portion of a lamination oi said armature.

Referring more particularly to the draw-A ings, the numeral y10 indicates the `top of a cabinet, to which the drive-motor and 'disc support are secured. A- number oi inverted posts 11 are secured to and depended from` the cabinet top 10. To these posts is secured anannular trame l2`which may suitably be' Vifornied afs a `single casting, this .traine encircling4 the opening in the cabinet top 1() through which the phonograph disc supporting` table passes. The frame 12 is provided with ,aV circular portion 12al and a. segmental enlarged portion 12". The circular portion 12 is approximately half a complete circle and is provided with inwardly-extending pole pieces 13 at spaced intervals. @if the pole pieces 13 alternate ones are wound with coils 14e, To the por- Specication of Letters Patent. y y:Padgnted luay 23, 19,22,

Application led April 11, 1221. Serial No. 460,229.

- tion 12b of the frame or casting is secured a segmentalv stator member 15 provided with inwardly-projecting teeth y16. The stator section 15 is preferably formedl of laminations, as shown. more clearly in Fig. 1 of the dra-wing. lThe stator member 15 is provided with two groups of windings.- Oneoi' these groups, indicated `by the numeral 1.7, is wound in the grooves, formed between the teeth 16 of the stator member 15 transyersely" around thelatter and are arranged in three sets, as more clearly shown in-the diagrammatic view of the windings inFig. 9. These windings are yin series, the successive windings being reversed with respect to each other. The windings o'l" the second group indicated by 17a, of which there are likewise three sets, are concentric and eX- tend around the teeth 16. These windings are in series with eachother, successive windings being reversed with respect to each other. The transverse windings and the concentric windings are in parallel.

A'transverse supporting baror bridge 18 tor the rotor parts oit' the device is provided at its ends with upwardly curved portions terminating in the plates 19 by which it is secured to the cabinet top `10. A hollow boss 2O is rigidly secured to the cross bar 18 and extends upwardly therefrom. p

Within the boss 20 is a vertical shaft 21, the lower end of which enters a bearing opening 22' in the bridge 18. 4The shaft 21 is centered in the boss 20 by the thrust bearing 23 mounted on the boss 2O and serving also as a -ilournalfor the shaft'21. The disc supporting table 24 is supported. upon the shaft 22 and is provided with a depending boss 25 through which the shaft 21 passes.

A number of depending posts 26 are se` cured to the under-,side ot the table 241 and to these are secured an annular rotor member 27 formed of laminations 28 and likewise a ring 29 ["rom which radial webs 30 extend to and are secured to the. boss 25 dependingfrom the table 24. The'laminations of the rotor member 27, as shown more Clearly in Fig. 8, are provided with slots 31, certain of `which at regularly spaced intervals are enlarged for the reception of coils, and are shown at 32. When the laminations 28 are assembled to form the rotor, a copper grid or squirrel cage 33- is fitted into the slots 31, as shown in elevation in Fig. 7.

`tail stationery shalt Zll.

Coils 2li :1re wound in the enlurged slots 82 prior to the placing ot the squirrel enge on the rotor.

The ring 2f) is 'formed with. the depending` posts 35, to which is secured u sinusoidal. cum ring Z130. The cum ring,y 3G is provided. with the lugs 37 which are secured to the posts 35 between telt v'ushers 718 by menus ot cup screws 30. This rine- Ylorins port ot the governor mecluinism, which is Very similur to that described in my prior etent No. 1,829,800, of Februury 3, 1920. The associated elements oi the governor mechanism are es follows:

A. depending' bracket et() secured to the freine 12 carries at its lower end e horizoni ll pon this is journnled n light-weight disc l2 by ineens ot n hub ll-S und u bushing Alli. T he dise l2 muy suitul'ily lire ot telt. '.ilunnuirn or the like,

Beyond the disc l2 is independently journaled s. sleeve 45, the end of which is 'formed :is ittorl; et@ which strnddles the edge of the cern ring 36. it its enos the ilforlrL 4.0 carries two relatively transverse plates or springs l? und 48, upon each ot which is mounted :L telt Contact or 'friction block ll0 und a metal contact block 50. T he distance between the contact blocks l0 :ind 50 on each of the plates holt the length oit one ol the waves oit the com 3G, und they 1re so orrunged 'that the 'telt triction block on either ot the plates tures the metul contact block on the other. rlhe distance between the opposing); contract blocks on the two plates is slightly greater thun the tl'iicltness ott the plates 36. tor the purpose hereinzrtter set :toi-th. rllhe sleeve i5 ot the ttork L.LG is connected to the bnluuce wheel i2 by menus ot u spiral spring' 5l, the inner end ot which is secured to thc sleeve also und the outer end to the balance wheel. 4t2. One end oi" n. light tension spring' 52 'is secured to the bnlunce wheel 42 :1t n point in horizontal alignment with its exis ot rotation, the other end oli this spring being secured to one cud o if lever 53, the other cnd ot whicl pivotod to n plete 54 secured to :1 support The tension upon the spring; 52 muy be ruricd by rotatingr n spiral cuni, 56 by means ot e knob orbutton 57 uboye the robinet top l0, the cum eiurueinn the lever The operation ot this governor ine-rhunisn'i hns been fully set forth .in my prior potent nhore re'lerred to.

The relation o't the various wirulings oit the devices to euch other is shown in. Fig. i). The windings Ile; in the rotor ure in .series with euch other. At one end. they are grounded. by means oit the tcrminul wire At the other end they are connected by the wire to the governor com wheel 3G. The tort: 46 carrying the plates 41:7 und i8 und the motel contact members 50 is connected by u wire or conductor G0 to the switch contar-t "1. The .ld coils 1.4i ure in series with euch other und ut one end are connected to thc conductor 60 by .ineens ot the conductor 02 und :it the other end nre connected by con* doctor G3 to the conductor (5ft, to which u moin line bringingin current G5 is likewise ionnected Switch termimll (S0 is groiindcd. tfhritch tcrminul 07 is connected to the torininulv (itl, to which the second moin. line (30 is likewise connected. Switch terininul connecteiil by coiuhictor 71 to the coils i7, which nre likewise connected et their other ends with the main line (i5. Switch terminal. 72 is connected through the windings 17 by conductor 73 and these windings ure in turn connected. to the conductor Gli- Fig. 9 shows the windings with the switch 7 in position tor use of the device with u direct cinrcnt. A ssuuiinp; that the line (i0 is positive and the line (ifi negative, the .llow ot the current is through .line (jfl to switch pole GS, then to switch terminal 67 from which it passes through the switch to hermiuul 60 und from there to the ground. It passers through the ground connection to the conductor from which it passes through the series ot windings let. ot the rotor :in d to the cuni rin` 30. From the com rino` 30 it posses :it the moments ot contact with the metal contact blocks o0 to the conducmr 00, -from which it travels through two puths in parallel. (lne ot these to switch termiruilv Gl. switch terminal 70, conductor 7l., and coils 17 to me in line (i5. The other is through conductor G2, coils lll; und conductors (33 und (B4-lto the moin line 05. .ln the position shown in this ligure, the metul contuct blocl-Is 50 ure in cont-:ict with the com ring.;` 3G, but nre just about to breuk contuct. As the upper :ind lower coutuct blocks 50 poss over the (west oit the wuvcs ot the cum rino; 36, they breuk cont-uct, the felt or insuloting,r contact blocks Aif) then beine' in contact with the ring'. rlhe 'tcl t contuct blficlis ll in turn breek coutuct sind the nictul contuct blocks 50 airain marke coutztct when the crest oil.l the next wure is renched. There thus one contact period between the nictul blocks 5t und the cuni rino' 3G lor euch complete waive. on the rinjr. The number oit coils I-llnre so disposed `with retereiice to the iicld coils 14tnnd '1.7 that contuct is nulde und current passes through thc coils :is coi s fllf u,ppronch the poles lormed by the coils .hl und 17, und the contact is broken :it the ring when the coils Ill; :irc opposite the polesI tormed by the coils 11i- :ind L17. The current zi.ssinn` through the. coils iil, 'tet :ind .17 is hence n` pulsating' direct current. lt desired, the coils 141 muy be omitted. the coils 17 alone being' suiticient tor the field lfor D. C. operotion. The direct current motor thus formed. is, ns is readilyV fippurent, not n selit storting motor, inasmuch is there ore certain positions thereolI in which storting will. not be effected. A slight rotation. ot' the llo table and of the rotor will start the motor at any time.

Then the switch is thrown to its reverse position, the series of coils 34 and lll are cut out and the coils 17 and 17a act upon the rotor provided with the squirrel cage to form an alternating current motor as set forth in my prior application Serial No. 290,705,1iled April 17, 1919, which is a division of my earlier application Serial No. 226,804, filed April 5, 1918.

l claim:

l. In a dynamo-electric drive for phonographs, a rotor secured to the phonograph table, said rotor comprising a magnetic ring, and a plurality of series connected windings at spaced angular' intervals around the ring, a stator having a plurality of angularly spaced series connected pole windings and means for passing intermittent direct our rent impulses simultaneously through the stator and rotor windings, said means comprising a contact ring having a sine-wave contour, an oscillatable fork straddling the ring, said fork having on each side' of the ring a contact member and a friction member spaced apart one-half of a wave of the ring, the contact member on each side facing the friction member on the other and being spaced therefrom somewhat more than the thickness of the ring whereby the contact members make contact with the ring simultaneously over one-half of each wave of the ring.

2. ln a dynamoelectric drive for phonographs, a rotor secured to the phonograph table, said rotor comprising a magnetic ring, and a plurality of series connected windings :it spaced angular intervals around the ring, a stator having a plurality of angularly spaced series connected pole windings and means for passing intermittent direct current impulses simultaneously through the stator and rotor windings, said means comprising a contact ring having a sine-wave contour, an oscillatable fork straddling the ring, said fork having on each side of the ring a contact member and a friction member spaced apart oneshalf of a wave of the ring, the contact member on each side facing the friction member on the other and being spaced therefrom somewhat more than the thickness of the ring whereby the contact members make contact with the ring simultaneously over one-half of each wave of the ring, and means for varying the periodicity of cscillation of the fork whereby it acts to govern the rate of travel of the ring by its braking effect thereon.

3. ik circuit control device comprising a ccntact ring having a sine-wave contour, a relatively stationary fork straddling said ring and having a contact member on each side thereof, said contact members being spaced apart somewhat more than the thickand means for rotating the contact ring having a sine-wave contour, an

oscillatable fork straddlingsaid ring, said fork having on each side of the ring a contact member and a friction member spaced apart one-half of a wave of the ring, the contact member on each side of the ring facing the friction member on the other and being spaced therefrom somewhat more than the thickness of the ring, and means for rotating the ring whereby the contact members make contact with the ring simultaneously over one-half of each wave of the ring.

5. A circuit control device comprising a contact ring having a sine-wave contour, an oscillatable fork straddling said ring, said fork having on each side of the-ring a contact member and a friction member spaced apart one-half of a wave of the ring, the contact member on each side of the ring facing the friction member on the other and being spaced therefrom .somewhat more than the thickness of the ring, and means for rotating the ring whereby the contact members make contact with the ring simultaneously over one-half of each wave of the ring, and means for varying the periodicity of oscillation of the fork whereby it acts to govern the rate of travel of the ring by its braking effect thereon.

6. In a dynamo electric drive for phonographs, a rotor secured to the phonograph table, said rotor comprising a magnetic ring, a copper grid embracing the ring and a plurality of coils at spaced angular intervals around the ring to form poles when energized, a first stator segment provided with spaced coils to form poles when energized, a second stator segment provided vwith spaced coils for producing a rotating field when energized by an alternating current, a contact ring having a sine-wave contour secured to the phonograph table, an oscillating on cach side of the ring a contact member and a friction member spaced apart onehalf of a wave length of the ring, the contact member on each'side facing the friction member on the other and being spaced therefrom somewhat more than the thickness of the ring, whereby the contact members make contact with the ring simultaneously over one-half of each wave of the ring, means for varying the periodicity of oscillation of the fork whereby it acts to govern the rate of travel of the ring by its braking effect thereon, series circuit connection between the contact ring and the rotor coils and the first stator segment and means for selectively directing current from a main line through said series connected elements or through the coils of the second stator segment.

HENRY K. siNDELL.

able fork straddling said ring, the fork hav 

